Method of Lubricating a Mechanical Device with High Pyrophosphate Level Lubricant
AssigneeThe Lubrizol Corporation
InventorsBrian B. Filippini, Suzanne Patterson, William R.S. Barton
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Abstract
A lubricant composition is provided containing an oil of lubricating viscosity and a substantially sulfur-free alkyl phosphate amine salt, where at least 30 mole percent of the phosphorus atoms are in an alkyl pyrophosphate salt structure, along with either or both of a conventional phosphorous containing antiwear additive and a glycerol ester. In the phosphate amine salt, at least 80 mole percent of the alkyl groups are typically secondary alkyl groups of 3 to 12 carbon atoms. A method of improving wear over a wide temperature range in a mechanical device is also provided by employing the lubricant composition.
Claims19
A lubricant composition comprising
- a. an oil of lubricating viscosity;
- b. an antiwear additive comprising a substantially sulfur-free alkyl phosphate amine salt wherein at least about 30 mole percent of the phosphorus atoms are in an alkyl pyrophosphate salt structure and at least about 80 mole percent of the alkyl groups are secondary alkyl groups of about 3 to about 12 carbon atoms;
- and
- c. at least one of,
- i. a hydrocarbyl amine salt of an alkylphosphoric acid ester,
- ii. a glycerol ester, and
- iii. mixtures of (i) and (ii).
Dependencies are inferred from the claim text.